Here is the latest (02/05/09) trick to free up the internet in airtel. You've just got to change ur homepage of the default airtel live setting. Change homepage as
https://letsbunk.com
Keep balance below 30 ps
*new*
Unlimited Download Using AIRTEL LIVE!!
Goto:
https://unblockcity.com
Keep balance below 30 paise. If you dont know how to get gprs when the balance is less than 15 Rs,follow these procedures-
>Dial *567# and activate MO service when the balance is less than 15
If its already activated,deactivate it first and then activate.
>Now quickly switch off your phone
>Switch on the phone after 2 hours
>Done!
so enjoy the free world.